US4405631A - Spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'pyrrolidine] compounds and their use as antihypertensive agents - Google Patents

Spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'pyrrolidine] compounds and their use as antihypertensive agents Download PDF

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US4405631A
US4405631A US06/410,155 US41015582A US4405631A US 4405631 A US4405631 A US 4405631A US 41015582 A US41015582 A US 41015582A US 4405631 A US4405631 A US 4405631A
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Prior art keywords
piperidine
benzodioxepin
compound
methylspiro
chain alkyl
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Raymond W. Kosley, Jr.
Robert J. Cherill
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Aventis Pharmaceuticals Inc
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Hoechst Roussel Pharmaceuticals Inc
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Assigned to HOECHST-ROUSSEL PHARMACEUTICALS INCORPORATED, A CORP OF DE. reassignment HOECHST-ROUSSEL PHARMACEUTICALS INCORPORATED, A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHERILL, ROBERT J., KOSLEY, RAYMOND W. JR.
Priority to US06/410,155 priority Critical patent/US4405631A/en
Priority to US06/516,832 priority patent/US4472580A/en
Priority to GR72231A priority patent/GR78667B/el
Priority to DE8383108156T priority patent/DE3376327D1/de
Priority to ES525013A priority patent/ES8505685A1/es
Priority to PH29413A priority patent/PH18839A/en
Priority to KR1019830003853A priority patent/KR840005729A/ko
Priority to NZ205320A priority patent/NZ205320A/en
Priority to EP83108156A priority patent/EP0102034B1/en
Priority to FI832959A priority patent/FI832959A7/fi
Priority to AT83108156T priority patent/ATE33656T1/de
Priority to NO833001A priority patent/NO833001L/no
Priority to PT77223A priority patent/PT77223B/pt
Priority to AU18169/83A priority patent/AU576473B2/en
Priority to JP58150473A priority patent/JPS5953489A/ja
Priority to IL69525A priority patent/IL69525A0/xx
Priority to DK381983A priority patent/DK381983A/da
Priority to CA000434928A priority patent/CA1210764A/en
Priority to HU832920A priority patent/HU191874B/hu
Priority to ZA836127A priority patent/ZA836127B/xx
Priority to MA20103A priority patent/MA19881A1/fr
Publication of US4405631A publication Critical patent/US4405631A/en
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Priority to US06/595,781 priority patent/US4521537A/en
Priority to US06/630,134 priority patent/US4577026A/en
Priority to US06/630,135 priority patent/US4569998A/en
Priority to US06/630,145 priority patent/US4579950A/en
Priority to ES540841A priority patent/ES8602800A1/es
Priority to US06/765,740 priority patent/US4668791A/en
Priority to US06/811,245 priority patent/US4695637A/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D491/00—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00
    • C07D491/02—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains two hetero rings
    • C07D491/10—Spiro-condensed systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/04—Centrally acting analgesics, e.g. opioids
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • A61P9/12—Antihypertensives
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
    • C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
    • C07D211/36—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D211/40—Oxygen atoms
    • C07D211/44—Oxygen atoms attached in position 4
    • C07D211/48—Oxygen atoms attached in position 4 having an acyclic carbon atom attached in position 4
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D321/00—Heterocyclic compounds containing rings having two oxygen atoms as the only ring hetero atoms, not provided for by groups C07D317/00 - C07D319/00
    • C07D321/02—Seven-membered rings
    • C07D321/10—Seven-membered rings condensed with carbocyclic rings or ring systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D491/00—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00
    • C07D491/02—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains two hetero rings
    • C07D491/10—Spiro-condensed systems
    • C07D491/113—Spiro-condensed systems with two or more oxygen atoms as ring hetero atoms in the oxygen-containing ring

Definitions

  • This invention relates to spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'-pyrrolidine] compounds.
  • the compounds are useful in the treatment of hypertension in mammals.
  • Hypertension in mammals may accompany many disorders, such as renal disease, disease of the adrenal gland and toxemia of pregnancy. In most patients with high blood pressure, however, no primary disorder is evident and the condition is referred to as essential hypertension.
  • hypertensive patients have more frequent cerebral and other cardiovascular accidents than those whose blood pressure has been lowered by drugs.
  • hypertension may exist without inducing symptoms in the patient, it is more usual that clinical manifestations develop after elevated blood pressure has persisted for some time.
  • hypertension has been associated with secondary effects, such as headache, dizziness, nose-bleeding, breathlessness on exertion, heart failure and stroke. Since these secondary effects may present a danger to life, it is desirable to lower the blood pressure and maintain it at a more nearly normal level.
  • R 1 is a C 3 or C 4 branched or straight chain alkyl or alkenyl group or a C 4 -alkynyl group terminally substituted by one or two substituents independently selected from the group consisting of ##STR3## where
  • Y and Z are the same or different and are independently selected from the group consisting of H, Cl, F, Br, I, --NO 2 , --CF 3 , C 1 to C 4 straight chain alkyl, alkoxy containing C 1 to C 4 straight chain alkyl, acyl or --NH 2 ;
  • each R 5 substituent is independently selected from the group consisting of ##STR4##
  • R 3 is hydrogen or a C 1 to C 3 straight chain alkyl group
  • R 4 is hydrogen or a C 1 to C 3 straight chain alkyl group
  • n is zero, 1 or 2;
  • X is Cl, F, Br, I, --NO 2 , --CF 3 , --NR 6 R 7 , ##STR5## C 1 to C 6 branched or straight chain alkyl, --CN, --O--R 6 , --SR 7 , --SO 3 R 7 , ##STR6## --NHCOR 8 , --SO 2 R 9 or --SOR 9
  • R 6 is hydrogen or a C 1 to C 6 straight chain alkyl group
  • R 7 is hydrogen or a C 1 to C 6 straight chain alkyl group
  • R 8 is a C 1 to C 6 branched or straight chain alkyl group
  • R 9 is a C 1 to C 6 straight chain alkyl group
  • the X-substituents can be the same only when X is selected from the group consisting of H, Cl, F, Br, I, C 1 to C 6 branched or straight chain alkyl or --O--R 6 ;
  • n zero or 1;
  • R 1 is a C 4 -alkynyl group
  • the acetylenic bond is between carbon atom numbers 2 and 3 of the group, i.e., --CH 2 --C.tbd.C--CH ⁇ .
  • the compounds of the invention are represented by the following formula ##STR7## wherein R 1 is a C 4 branched or straight chain alkyl or alkenyl group terminally substituted by p-fluorophenyl, bis-phenyl or bis-p-fluorophenyl groups; or R 1 is ##STR8## wherein
  • R 2 , R 3 and R 4 are independently selected from hydrogen and --CH 3 ;
  • X is H, Cl, F, Br, I, --NO 2 , --CH 3 or ##STR9##
  • R 5 , Y and Z are defined above;
  • n is zero, 1 or 2;
  • n zero or 1;
  • the X-substituents can be the same only when X is selected from the group consisting of H, Cl, F, Br, I, --CH 3 and --OCH 3
  • R 3 is H or --CH 3 ;
  • X is H, Cl, F or Br
  • This invention also provides compounds of the following formulae, which are useful intermediates in the preparation of the pharmaceutically active compounds of the invention: ##STR11## where X and m are as previously defined;
  • R is hydrogen or a methyl, acyl or benzyl group
  • HAL is chlorine or fluorine.
  • This invention also provides processes for preparing the compounds of this invention.
  • this invention provides a method of alleviating hypertension in a mammal by administering to a mammal a pharmaceutically active compound of the invention in an amount sufficient to reduce the blood pressure of the mammal.
  • this invention provides a pharmaceutical composition
  • a pharmaceutical composition comprising a pharmaceutically active compound of the invention and a pharmaceutically acceptable carrier therefor.
  • the starting reactant is an N-substituted-4-piperidone of formula (1), which is commercially available or can be prepared using well-known techniques for synthesizing organic compounds.
  • the substituent R shown in this Figure can typically be a methyl, acyl or benzyl group.
  • the piperidone of formula (1) can be reacted in tetrahydrofuran (THF) with an ammonical solution of sodium acetylide to obtain a 1-substituted-4-ethynyl-4-piperidinol of formula (2).
  • THF tetrahydrofuran
  • the resulting 1-substituted-4-ethynyl-piperidinol can be reacted with a substituted or unsubstituted o-halobenzylchloride of formula (3) in solution in the presence of a base, such as potassium t-butoxide or sodium hydride, to yield a 1-substituted-4-ethynyl-4-(o-halobenzyloxy)-piperidine of formula (4).
  • a base such as potassium t-butoxide or sodium hydride
  • Substituted and unsubstituted compounds of formula (3) are also readily available or can be prepared using conventional techniques.
  • the halo group in the compounds of formula (3) is identified in FIG. 1 as HAL and is chlorine or fluorine, the latter being preferred.
  • Hydrolysis converts the ethynyl group in the compound of formula (4) to an oxoethyl group. This is achieved by reacting the compound of formula (4) with water catalyzed by mercuric sulphate in an acidic medium, such as methanol/sulphuric acid. The resulting 4-(1-oxoethyl)-4-(o-halobenzyloxy)-piperidine of formula (5) is isolated. If the substituent R in the compound of formula (4) is an acyl group, this group is hydrolyzed so that R is hydrogen in the compound of formula (5).
  • the keto group of the compound of formula (5) is reduced to a hydroxyl group in solution by sodium borohydride, for example, to form a 4-(1-hydroxyethyl)-4-(o-halobenzyloxy)-piperidine of formula (6).
  • the alcohol of formula (6) can be cyclized to form the dioxepin ring system of the compounds of the invention.
  • the cyclization can be carried out in the presence of a base, such as potassium t-butoxide or sodium hydride, in a solvent, such as dimethyl sulfoxide (DMSO) or THF, at temperatures from room temperature to reflux temperature.
  • a base such as potassium t-butoxide or sodium hydride
  • a solvent such as dimethyl sulfoxide (DMSO) or THF
  • the compound of formula (8) can be obtained from the compound of formula (7) by removing the methyl, acyl or benzyl group using conventional techniques.
  • R is methyl
  • the compound of formula (7) can be converted to a carbamate, such as by reaction with ethyl chloroformate, followed by hydrolysis with a base, such as potassium hydroxide.
  • a base such as potassium hydroxide.
  • R is a benzyl group.
  • the benzyl group can be removed by catalytic hydrogenation, such as by use of a palladium on carbon catalyst. If the substituent R is an acyl group, the acyl group will usually be removed during the formation of the compound of formula (5), but similar hydrolysis of the compound of formula (7) will yield the compound of formula (8).
  • the substituent R 1 can be introduced into the compounds by alkylation of the piperidine nitrogen of the compound of formula (8) with substituted alkyl, alkenyl or alkynyl halides or sulfonate esters to obtain a compound of formula (9).
  • the reaction can be carried out in an aprotic solvent, such as N,N-dimethylformamide (DMF) or n-butyl acetate.
  • the reaction is carried out in the presence of an acid scavenger, such as potassium carbonate or sodium carbonate.
  • Sodium bicarbonate can be employed with some base sensitive materials or olefins.
  • a catalyst, such as potassium iodide, can also be employed.
  • the reaction is typically carried out at a temperature from about ambient to about 125° C., preferably about 20° C. to about 90° C. Typically, the reaction time will be about 45 minutes to about 18 hours. While the reactants can be employed in equimolar amounts, the alkyl, alkenyl or alkynyl halide is often used in excess amount. Generally, the alkyl, alkenyl and alkynyl halides will not exceed about 10% molar excess of the compound of formula (8). If the R 1 substituent contains an olefinic group, it may be necessary to add alkylating agent to the reaction medium to replace portions of the agent that may undergo side reactions.
  • the alkylating reaction can be carried out in air or under inert gas, such as a nitrogen blanket. It is preferable to mildly agitate the reaction mixture during the course of the reaction.
  • the alkylating agents employed in this invention are either commercially available or can be prepared by conventional techniques.
  • the resulting compound can then be reacted with acidified aqueous alcohol solution at elevated temperature to form a piperidine of the invention in which R 1 is ##STR13##
  • a piperidine of the invention in which R 1 is ##STR13##
  • a reducing agent such as sodium borohydride
  • the resulting hydroxyl-containing substituent can be converted to an ether-containing substituent of the formula ##STR15## where Y and Z are previously defined, by formation of an anion with, for example, sodium hydride, and then reaction with an aryl halide, for example, 1,4-difluorobenzene.
  • substituent --X can often be readily introduced into the compounds using conventional techniques. Addition of substituent --X to the benzodioxepin ring system is facilitated by the presence of the oxygen in the 1-position of the dioxepin ring, which functions as an ortho/para-directing substituent.
  • a salt of the compound of formula (7) or (8) can be reacted with N-chlorosuccinimide or N-bromosuccinimide in solution.
  • a compound of formula (7) or (8) in which the substituent --X is chlorine or bromine, respectively, will be obtained.
  • Other similarly well-known reactions can be employed to introduce other species of the X-substituent into the compounds.
  • R 2 When the substituent R 2 is other than hydrogen the R 2 substituent is conveniently introduced into the compounds of the invention during an early stage of preparation.
  • R 2 can be substituted onto the piperidone of formula (1) by alkylation via an enamine.
  • the piperidone can be converted to enamine, which can be alkylated.
  • Other standard methods, such as formation of a hydrazone followed by alkylation and hydrolysis to form a ketone, can also be employed.
  • R 4 is other than hydrogen
  • R 4 is other than hydrogen
  • the substituent R 4 can be introduced as part of the compound of formula (3).
  • benzyl chloride (3) a compound of the formula ##STR16## can be utilized where X, m, HAL and R 4 are as previously defined.
  • Compounds of this type can be readily prepared using conventional techniques.
  • the R 3 substituent is conveniently introduced into the compounds of the invention at an intermediate stage of the synthesis.
  • addition of a Grignard reagent to the aldehyde of formula (15) in FIG. 2 and hydrolysis of the resulting intermediate will form an alcohol analogous to the compound of formula (6).
  • the aldehyde of formula (15) can be synthesized as shown or by other methods known in the art.
  • other well-known methods for adding alkyl groups to aldehydes and ketones can be employed.
  • the alcohol (13) is reacted with a substituted or unsubstituted o-halobenzylchloride of formula (3) as previously described.
  • This reaction can be carried out in a solvent, such as tetrahydrofuran, in the presence of a base, such as potassium t-butoxide, to form the compound of formula (14).
  • the ketone of formula (15) is formed by reacting the compound of formula (14) with mercuric oxide in the presence of boron trifluoride in solution.
  • the alcohol of formula (16) is prepared from the ketone (15) using the technique described in connection with the preparation of the alcohol of formula (6) in FIG. 1.
  • the alcohol of formula (16) can then be cyclized as previously described to form the compound of formula (17).
  • compounds of the invention containing the substituent R 1 can be readily prepared by alkylation of the piperidine nitrogen with substituted alkyl, alkenyl or alkynyl halides or sulfonate esters, as previously described.
  • Conversion to the secondary amino group can be accomplished by reacting the compound of formula (17) with phenylchloroformate to convert the methyl group to a phenoxycarbonyl group as shown in formula (18), which can then be converted to the free base of formula (19) by reaction with aqueous sodium hydroxide in a solvent, such as methanol.
  • this invention includes the compounds of the invention in all of their stereoisomeric forms, including their enantiomers and diastereomers. This invention also contemplates using mixtures of such forms in the treatment of hypertension in mammals.
  • the compounds of the invention and intermediates for their preparation can exist in either the form of a free base or as an acid addition salt.
  • the precipitate can be recovered and purified, and the resulting salt converted to its free base by addition to an alkaline medium.
  • Antihypertensive activity is measured in the spontaneous hypertensive rat by the indirect tail cuff method described by A. Schwartz, Ed., Methods in Pharmacology, Vol. I, page 135, Appleton Century Crafts, New York (1971). In this procedure, a group of five animals is treated orally with the drug for three days in relation to a control group of the same number. The drop in blood pressure is measured on the third day following administration. The antihypertensive activity is expressed as mm Hg decrease in mean arterial blood pressure.
  • SHR spontaneous hypertensive rat
  • Table I The dose is indicated as mg of the compound per kg body weight by peroral (PO) administration.
  • the dose of the compounds of the invention will be from about 0.1 to about 50 mg/kg of body weight per day.
  • the compounds of the present invention may be administered in a pharmaceutically effective amount to a subject by a convenient route, such as orally, intramuscularly, intravenously, subcutaneously or intraperitoneally.
  • a convenient route such as orally, intramuscularly, intravenously, subcutaneously or intraperitoneally.
  • the preferred route of administration is oral, for example, with an inert diluent or with an edible carrier or in gelatin, capsules or tablets.
  • the active compounds of this invention may be incorporated with excipients and used in the form of tablets, troches, capsules, exilirs, suspensions, syrups, wafers, chewing gum and the like. These preparations should contain at least about 0.5% by weight of active compound, but the amount of active ingredient may be varied depending on the particular form and may typically be between about 7 to about 70% by weight of the unit. The amount of active compound in such compositions is such that a suitable dosage will be obtained.
  • Preferred compositions in preparations according to the present invention are prepared so that an oral dosage unit form contains between about 1 and about 200 mg of active compound.
  • the tablets, pills, capsules, troches and the like may also contain the following adjuvants; a binder, such as gum tragacanth or gelatin; an excipient, such as starch or lactose; a disintegrating agent, such as algenic acid, potato starch and the like; a lubricant, such as magnesium stearate; a sweetening agent, such as sucrose or saccharine, or a flavoring agent, such as peppermint, methylsalicylate or orange flavoring.
  • a binder such as gum tragacanth or gelatin
  • an excipient such as starch or lactose
  • a disintegrating agent such as algenic acid, potato starch and the like
  • a lubricant such as magnesium stearate
  • a sweetening agent such as sucrose or saccharine
  • a flavoring agent such as peppermint, methylsalicylate or orange flavoring.
  • a liquid carrier such as a fatty oil.
  • tablets or pills may be coated with sugar, shellac, or both.
  • a syrup may contain, in addition to the active compounds, sucrose as a sweetening agent, preservatives, colorings, and flavors. Materials employed in preparing these various compositions must be pharmaceutically pure and non-toxic in the amounts utilized.
  • the active compounds of the invention may be incorporated into a solution or suspension. These preparations should contain at least about 0.1% by weight of active compound, but may be varied to typically contain about 0.5 to about 30% of the weight thereof. The amount of active compound in such compositions is such that a suitable dosage will be obtained. Preferred compositions in preparations according to the present invention are prepared so that a parenteral dosage unit contains between about 0.5 to about 100 mg of active compound.
  • the solutions or suspensions may also include the following components: a sterile diluent, such as water, for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents, such as benzyl alcohol or methyl paraben; antioxidants, such as ascorbic acid or sodium bisulfite; chelating agents, such as ethtylenediamine tetraacetic acid; buffers, such as acetates, citrates, or phosphates; and agents for the adjustment of tonicity, such as sodium chloride or dextrose.
  • Parenteral preparations can be enclosed in ampules, disposable syringes or multiple dose vials made of glass or plastic.
  • the compounds of the invention while effective in themselves, may be formulated and administered in the form of their pharmaceutically acceptable addition salts for purposes of stability, convenience of crystallization, increased solubility and the like.
  • Such salts include the salts of inorganic acids, such as hydrochloric acid, hydrobromic acid, sulfuric acid and nitric acid. Salts of organic acids, such as citric, fumaric, maleic and tartaric acids, can also be employed.
  • the compound 4-(1-oxoethyl)-4-(2-fluorophenylmethoxy)piperidine oxalate (10.00 g, 29.00 mmole) was converted to its free base with saturated aqueous sodium bicarbonate and extracted into chloroform. The organic layer was dried over anhydrous magnesium sulfate, filtered and the chloroform was removed in vacuo. The residue was dissolved in 20 ml of methanol and added dropwise to a suspension of 2.76 g of sodiumborohydride (73.00 mmole) in 30 ml of methanol. This was maintained at 20° C. (using an ice bath) and was allowed to react overnight at ambient temperature under nitrogen.
  • the compound 2-methylspiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine]hydrochloride (4.0 g, 15.0 mmole) was dissolved in 150 ml of DMF. To the solution was added 4 g of potassium carbonate (milled, anhydrous), 15 mg of potassium iodide, and 5.12 g of 4,4-bis(4-chlorophenyl)butylchloride (15.0 mmole). The reaction mixture was stirred at 80° C., under nitrogen, overnight. The reaction was determined to be complete by TLC. The mixture was quenched with an equal volume of water and extracted with ether.
  • the compound 7-bromo-2-methylspiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine]hydrochloride (7.0 g, 20.1 mmole) was dissolved in 150 ml of DMF. The solution was stirred with 7.0 g of potassium carbonate (milled, anhydrous), 15 mg of potassium iodide and 6.2 g of 4,4-bis(4-fluorophenyl)butyl chloride (22.1 mmole) at 80° C. under nitrogen overnight. The reaction, which was determined to be complete by TLC, was cooled to ambient temperature, quenched with an equal volume of water, and extracted with ether.
  • the ether extracts were combined, backwashed with saturated brine and reduced in volume under vacuum.
  • the residue was dissolved in 800 ml of methanol and 300 ml of 3 N hydrochloric acid. The mixture was heated to reflux under nitrogen and stirred for 2 hr. The solution was cooled and reduced in volume under vacuum.
  • the residue was suspended in saturated aqueous sodium carbonate and extracted into ether.
  • the extracts were combined, backwashed with saturated brine and dried over anhydrous potassium carbonate.
  • the ether was removed under vacuum from the extract and the residue loaded onto a 1000 g alumina column packed in ether. Fractions of 500 ml of ether were collected and the desired product was found in numbers 2-4, which were combined.
  • the compound 1-acetyl-4-ethynyl-4-(2,5-difluorophenylmethoxy)piperidine (5 g, 17.1 mmole) was suspended in 50 ml of 15% sulfuric acid. The mixture was heated at reflux under nitrogen for 1 hr. after which complete dissolution occurred. Mercuric sulfate (0.25 g, freshly opened) was added to the cooled solution. The mixture was heated at 65° C. overnight. The reaction was determined to be 98% complete by GLC. The mixture was basified with saturated aqueous sodium carbonate and extracted with chloroform. The organic extracts were combined, dried over K 2 CO 3 and filtered through celite. The filtrate was reduced in volume under vaccum and the residue dissolved in ether.
  • the compound 4-(1-oxoethyl)-4-(2,5-difluorophenylmethoxy)piperidine hydrochloride (5 g, 16.4 mmole) was dissolved in 50 ml of water. The pH was adjusted to 8.5 using 50% sodium hydroxide. Sodium borohydride (0.2 g, 4.5 mmole) was added to the solution and the mixture was allowed to react for 1/2 hr. The reaction was determined to be complete by GLC. The reaction mixture was saturated with potassium carbonate and extracted with ether. The ether extracts were combined, dried, and filtered. The solvent was removed under vacuum resulting in 4 g of solid white material.
  • Example 31 to 36 an alternate method for preparing the compound of formula (+7) in FIG. 1 is described.
  • the 1-methyl-4-ethynyl-4-hydroxypiperidine employed as starting material in Example 31 can be prepared by the method disclosed in N. Barbulescu, C. Bornaz and C. Greff, Rev. Chim. (Bucharest) 20 (6): 373-374 (1969).
  • the compound 1-acetyl-4-ethynyl-4-(2,5-difluorophenylmethoxy)piperidine (5 g, 17.06 mmole) was suspended in 50 ml of 15% sulfuric acid. The mixture was heated at reflux under nitrogen for 1 hr, after which complete dissolution occurred. Mercuric sulfate (0.25 g, freshly opened) was added to the cooled solution. The mixture was heated at 65° C. overnight. The reaction was determined to be 98% complete by GLC. The mixture was basified with saturated aqueous sodium carbonate and extracted with chloroform. The organic extracts were combined, dried over K 2 CO 3 and filtered through celite. The filtrate was reduced in volume under vacuum and the residue dissolved in ether.
  • the compound 4-(1-oxoethyl)-4-(2,5-difluorophenylmethoxy) piperidine hydrochloride (5 g, 16.4 mmole) was dissolved in 50 ml of water. The pH was adjusted to 8.5 using 50% sodium hydroxide. Sodium borohydride (0.2 g, 4.5 mmole) was added to the solution and the mixture was allowed to react for 1/2 hour. The reaction was determined to be complete by GLC. The reaction mixture was saturated with potassium carbonate and extracted with ether. The ether extracts were combined, dried and filtered. The solvent was removed under vacuum resulting in 4 g of solid white material.
  • the compound 4-(1-hydroxyethyl)-4-(2,5-difluorophenylmethoxy)piperidine (84.4 g, 0.311 mole) was dissolved in 510 ml of dry THF and stirred with 36.6 g of potassium tert-butoxide (0.326 mole). The mixture was heated at reflux under nitrogen for 8 hr after which a 10% excess of potassium tert-butoxide was added. The mixture was heated 6 hr after which the reaction was determined to be complete by GLC. The mixture was cooled and quenched with saturated aqueous sodium carbonate. The product was extracted into ether and dried over potassium carbonate. The dried ether extracts were filtered and the hydrochloride salt was precipitated.

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US06/410,155 1982-08-20 1982-08-20 Spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'pyrrolidine] compounds and their use as antihypertensive agents Expired - Fee Related US4405631A (en)

Priority Applications (28)

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US06/410,155 US4405631A (en) 1982-08-20 1982-08-20 Spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'pyrrolidine] compounds and their use as antihypertensive agents
US06/516,832 US4472580A (en) 1982-08-20 1983-07-25 Spiro (2H-1,4-benzodioxepin-3 (5H)4-piperidine and -3-pyrrolidine) compounds and their use as anti-hypertensive agents
GR72231A GR78667B (enrdf_load_html_response) 1982-08-20 1983-08-17
DE8383108156T DE3376327D1 (en) 1982-08-20 1983-08-18 Spiro(2h-1,4-benzodioxepin-3(5h)4'-piperidine and 3'-pyrrolidino) compounds, a process for preparing the same and their use as medicaments
ES525013A ES8505685A1 (es) 1982-08-20 1983-08-18 Un procedimiento para preparar compuestos de espiro (2h-1,4-benzodioxepin-3(5h)4'-piperidina y -3'-pirrolidina)
PH29413A PH18839A (en) 1982-08-20 1983-08-18 Spiro (2h-1,4-benzodioxepin-3(5h)4'-piperidine and 3'-pyrrolidine) compounds and their use as antihypertensive agents
KR1019830003853A KR840005729A (ko) 1982-08-20 1983-08-18 스피로〔2h-1, 4-벤조디옥세핀-3(5h)4'-피페리딘 및 3'-피롤리디노〕화합물의 제조방법
NZ205320A NZ205320A (en) 1982-08-20 1983-08-18 Benzodioxepine spiro derivatives and pharmaceutical compositions
EP83108156A EP0102034B1 (en) 1982-08-20 1983-08-18 Spiro(2h-1,4-benzodioxepin-3(5h)4'-piperidine and 3'-pyrrolidino) compounds, a process for preparing the same and their use as medicaments
FI832959A FI832959A7 (fi) 1982-08-20 1983-08-18 Spiro/2h-1,4-benzodiazepin-3(5h)4'-piperidin och 3'-pyrrolidin/foereningar, foerfarande foer deras framstaellning och deras anvaendning som laekemedel
AT83108156T ATE33656T1 (de) 1982-08-20 1983-08-18 Spiro(2h,1,4-benzodioxepin-3(5h)4'-piperidin und 3'pyrrolidin)-verbindungen, verfahren zu ihrer herstellung und ihre anwendung als arzneimittel.
AU18169/83A AU576473B2 (en) 1982-08-20 1983-08-19 Spiro(2h-1,4-benzodioxepin-3(5h)4'-piperidine and 3'- pyrrolidino) compounds
ZA836127A ZA836127B (en) 1982-08-20 1983-08-19 Spiro(2h-1,4-benzodioxepin-3(5h)4'-piperidine and-3-pyrrolidine)compounds,a process for preparing the same and their use as medicaments
PT77223A PT77223B (en) 1982-08-20 1983-08-19 Spiro <2h-1,4-benzodioxepin-3(5h)4'-piperidine and 3'-pirrolidino> compounds,a process for preparing the same and their use as medicaments
NO833001A NO833001L (no) 1982-08-20 1983-08-19 Spiro(2h-1,4-benzodioksepin-3-(5h)4`-piperidin og 3`-pyrrolidinforbindelser, fremgangsmaate for deres fremstilling og deres anvendelse som legemidler
JP58150473A JPS5953489A (ja) 1982-08-20 1983-08-19 スピロ〔２ｈ−１，４−ベンゾジオキセピン−３（５ｈ）４′↓−ピペリジンおよび３′−ピロリジン〕化合物
IL69525A IL69525A0 (en) 1982-08-20 1983-08-19 Spiro(2h-1,4-benzodioxepin-3(5h)4'piperidine and 3'-pyrrolidino)compounds,a process for preparing the same and their use as medicaments
DK381983A DK381983A (da) 1982-08-20 1983-08-19 Fremgangsmaade til fremstilling af spiro(2h-1,4-benzodioxepin-3(5h)4'-piperidin- og -3'-pyrrolidinforbindelser
CA000434928A CA1210764A (en) 1982-08-20 1983-08-19 Spiro¬2h-1,4-benzodioxepin-3(5h)4'-piperidine and 3'-pyrrolidino| compounds, a process for preparing the same and their use as medicaments
HU832920A HU191874B (en) 1982-08-20 1983-08-19 Process for producing spiro/2h-1,4-benzodioxepine-3/5h/, 4-comma above-piperidine/ compounds
MA20103A MA19881A1 (fr) 1982-08-20 1983-08-20 Procede de preparation de derives de spiro (2h-1,4-benzodioxepine-3 (5h) 4'-piperidine et -3'-pyrrolidine).
US06/595,781 US4521537A (en) 1982-08-20 1984-04-02 Spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'-pyrrolidine] compounds and their use as antihypertensive agents
US06/630,134 US4577026A (en) 1982-08-20 1984-07-12 Intermediates for spiro[2H-1,4-benzodioxepin-3(5H)4'piperidine] compounds
US06/630,145 US4579950A (en) 1982-08-20 1984-07-12 Intermediates for spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine] compounds
US06/630,135 US4569998A (en) 1982-08-20 1984-07-12 Intermediates for spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'-pyrrolidine] compounds
ES540841A ES8602800A1 (es) 1982-08-20 1985-03-01 Un procedimiento compuesto de espiro 2h-1,4-benzodioxepin-3 (5h)4'-piperidina y -3'-pirrolidina
US06/765,740 US4668791A (en) 1982-08-20 1985-08-15 Intermediates for spiro[2H-1,4-benzodioxepin-3(5H)4'piperidine and -3'-pyrrolidine] compounds
US06/811,245 US4695637A (en) 1982-08-20 1985-12-19 Intermediates for spiro[2H-1,4 benzodioxepin-3(5H)4'-piperidine and -3'-pyrrolidine] compounds

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US06/410,155 US4405631A (en) 1982-08-20 1982-08-20 Spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'pyrrolidine] compounds and their use as antihypertensive agents

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US06/516,832 Division US4472580A (en) 1982-08-20 1983-07-25 Spiro (2H-1,4-benzodioxepin-3 (5H)4-piperidine and -3-pyrrolidine) compounds and their use as anti-hypertensive agents
US06/595,781 Continuation-In-Part US4521537A (en) 1982-08-20 1984-04-02 Spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'-pyrrolidine] compounds and their use as antihypertensive agents

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4472580A (en) * 1982-08-20 1984-09-18 Hoechst-Roussel Pharmaceuticals Incorporated Spiro (2H-1,4-benzodioxepin-3 (5H)4-piperidine and -3-pyrrolidine) compounds and their use as anti-hypertensive agents
US4521537A (en) * 1982-08-20 1985-06-04 Hoechst-Roussel Pharmaceuticals Incorporated Spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'-pyrrolidine] compounds and their use as antihypertensive agents
US4751223A (en) * 1986-10-14 1988-06-14 Hoechst-Roussel Pharmaceuticals, Inc. Antiinflammatory and analgesic aminoalkyl tetracyclic benzodiazepines

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH469736A (de) * 1966-06-28 1969-03-15 Geigy Ag J R Verfahren zur Herstellung von neuen Heterospiroalkanen

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1312894A (fr) * 1962-01-29 1962-12-21 Geigy Ag J R Nouveaux composés hétérocycliques à 2 atomes d'oxygène dans le cycle et leur préparation
US3679666A (en) * 1969-04-03 1972-07-25 Hoffmann La Roche 4-(4-hydroxypiperidino)-4'-fluorobutyrophenones

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH469736A (de) * 1966-06-28 1969-03-15 Geigy Ag J R Verfahren zur Herstellung von neuen Heterospiroalkanen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4472580A (en) * 1982-08-20 1984-09-18 Hoechst-Roussel Pharmaceuticals Incorporated Spiro (2H-1,4-benzodioxepin-3 (5H)4-piperidine and -3-pyrrolidine) compounds and their use as anti-hypertensive agents
US4521537A (en) * 1982-08-20 1985-06-04 Hoechst-Roussel Pharmaceuticals Incorporated Spiro[2H-1,4-benzodioxepin-3(5H)4'-piperidine and -3'-pyrrolidine] compounds and their use as antihypertensive agents
US4751223A (en) * 1986-10-14 1988-06-14 Hoechst-Roussel Pharmaceuticals, Inc. Antiinflammatory and analgesic aminoalkyl tetracyclic benzodiazepines

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ES540841A0 (es) 1985-12-01
PH18839A (en) 1985-10-10
HU191874B (en) 1987-04-28
DE3376327D1 (en) 1988-05-26
KR840005729A (ko) 1984-11-16
MA19881A1 (fr) 1984-04-01
GR78667B (enrdf_load_html_response) 1984-09-27
EP0102034B1 (en) 1988-04-20
DK381983D0 (da) 1983-08-19
ZA836127B (en) 1984-04-25
ES525013A0 (es) 1985-06-01
CA1210764A (en) 1986-09-02
PT77223A (en) 1983-09-01
EP0102034A1 (en) 1984-03-07
FI832959A7 (fi) 1984-02-21
PT77223B (en) 1986-03-18
AU576473B2 (en) 1988-09-01
ATE33656T1 (de) 1988-05-15
ES8602800A1 (es) 1985-12-01
NZ205320A (en) 1987-05-29
AU1816983A (en) 1984-02-23
NO833001L (no) 1984-02-21
ES8505685A1 (es) 1985-06-01
IL69525A0 (en) 1983-11-30
DK381983A (da) 1984-02-21
FI832959A0 (fi) 1983-08-18

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